At once
At once adverb - Without delay or hesitation; with no time intervening.
Without any delay and at once are semantically related. In some cases you can use "Without any delay" instead an adverb phrase "At once".
Without any delay
At once and without any delay are semantically related. You can use "At once" instead an adverb phrase "Without any delay".
Mutual synonyms
Cite this Source
Without any delay and At once. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/at_once/without_any_delay
At once & Without any delay. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/at_once/without_any_delay>.
Without any delay or At once. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/at_once/without_any_delay.
